#include "symbol_table_t.h"
#include "adt/error.h"
#include "adt/strset.h"
+#include "adt/util.h"
#include <assert.h>
#include <errno.h>
//static FILE **input_stack;
//static char **buf_stack;
-static
-void error_prefix_at(const char *input_name, unsigned linenr)
+static void error_prefix_at(const char *input_name, unsigned linenr)
{
- fprintf(stderr, "%s:%d: Error: ", input_name, linenr);
+ fprintf(stderr, "%s:%u: Error: ", input_name, linenr);
}
-static
-void error_prefix(void)
+static void error_prefix(void)
{
error_prefix_at(lexer_token.source_position.input_name,
lexer_token.source_position.linenr);
}
-static
-void parse_error(const char *msg)
+static void parse_error(const char *msg)
{
error_prefix();
fprintf(stderr, "%s\n", msg);
}
-static inline
-void next_char(void)
+static inline void next_real_char(void)
{
bufpos++;
if(bufpos >= bufend) {
bufend = buf + MAX_PUTBACK + s;
}
c = *(bufpos);
-#ifdef DEBUG_CHARS
- printf("nchar '%c'\n", c);
-#endif
}
-static inline
-void put_back(int pc)
+static inline void put_back(int pc)
{
char *p = (char*) bufpos - 1;
bufpos--;
#endif
}
+static inline void next_char(void);
-static
-int replace_trigraph(void)
-{
-#define MATCH_TRIGRAPH(ch,replacement) \
- case ch: \
- c = replacement; \
- return 1;
+#define MATCH_NEWLINE(code) \
+ case '\r': \
+ next_char(); \
+ if(c == '\n') { \
+ next_char(); \
+ } \
+ lexer_token.source_position.linenr++; \
+ code; \
+ case '\n': \
+ next_char(); \
+ lexer_token.source_position.linenr++; \
+ code;
+static void maybe_concat_lines(void)
+{
+ next_char();
switch(c) {
- MATCH_TRIGRAPH('=', '#')
- MATCH_TRIGRAPH('(', '[')
- MATCH_TRIGRAPH('/', '\\')
- MATCH_TRIGRAPH(')', ']')
- MATCH_TRIGRAPH('\'', '^')
- MATCH_TRIGRAPH('<', '{')
- MATCH_TRIGRAPH('!', '|')
- MATCH_TRIGRAPH('>', '}')
- MATCH_TRIGRAPH('-', '~')
+ MATCH_NEWLINE(return;)
+
default:
break;
}
- return 0;
+ put_back(c);
+ c = '\\';
}
-#define SKIP_TRIGRAPHS(custom_putback, no_trigraph_code) \
- case '?': \
- next_char(); \
- if(c != '?') { \
- custom_putback; \
- put_back(c); \
- c = '?'; \
- no_trigraph_code; \
- } \
- next_char(); \
- if(replace_trigraph()) { \
- break; \
- } \
- custom_putback; \
- put_back('?'); \
- put_back(c); \
- c = '?'; \
- no_trigraph_code;
-
-#define EAT_NEWLINE(newline_code) \
- if(c == '\r') { \
- next_char(); \
- if(c == '\n') \
- next_char(); \
- lexer_token.source_position.linenr++; \
- newline_code; \
- } else if(c == '\n') { \
- next_char(); \
- lexer_token.source_position.linenr++; \
- newline_code; \
+static inline void next_char(void)
+{
+ next_real_char();
+
+ /* filter trigraphs */
+ if(UNLIKELY(c == '\\')) {
+ maybe_concat_lines();
+ goto end_of_next_char;
+ }
+
+ if(LIKELY(c != '?'))
+ goto end_of_next_char;
+
+ next_real_char();
+ if(LIKELY(c != '?')) {
+ put_back(c);
+ c = '?';
+ goto end_of_next_char;
}
+ next_real_char();
+ switch(c) {
+ case '=': c = '#'; break;
+ case '(': c = '['; break;
+ case '/': c = '\\'; maybe_concat_lines(); break;
+ case ')': c = ']'; break;
+ case '\'': c = '^'; break;
+ case '<': c = '{'; break;
+ case '!': c = '|'; break;
+ case '>': c = '}'; break;
+ case '-': c = '~'; break;
+ default:
+ put_back('?');
+ put_back(c);
+ c = '?';
+ break;
+ }
+
+end_of_next_char:
+#ifdef DEBUG_CHARS
+ printf("nchar '%c'\n", c);
+#else
+ ;
+#endif
+}
+
#define SYMBOL_CHARS \
case 'a': \
case 'b': \
case '8': \
case '9':
-static
-void parse_symbol(void)
+static void parse_symbol(void)
{
symbol_t *symbol;
char *string;
while(1) {
switch(c) {
- case '\\':
- next_char();
- EAT_NEWLINE(break;)
- goto end_symbol;
-
DIGITS
SYMBOL_CHARS
obstack_1grow(&symbol_obstack, c);
next_char();
break;
- case '?':
- next_char();
- if(c != '?') {
- put_back(c);
- c = '?';
- goto end_symbol;
- }
- next_char();
- if(replace_trigraph())
- break;
- put_back('?');
- put_back(c);
- c = '?';
- goto end_symbol;
-
default:
goto end_symbol;
}
}
+
end_symbol:
obstack_1grow(&symbol_obstack, '\0');
}
}
-static
-void parse_number_hex(void)
+static void parse_integer_suffix(void)
+{
+ if(c == 'U' || c == 'U') {
+ /* TODO do something with the suffixes... */
+ next_char();
+ if(c == 'L' || c == 'l') {
+ next_char();
+ if(c == 'L' || c == 'l') {
+ next_char();
+ }
+ }
+ } else if(c == 'l' || c == 'L') {
+ next_char();
+ if(c == 'l' || c == 'L') {
+ next_char();
+ if(c == 'u' || c == 'U') {
+ next_char();
+ }
+ } else if(c == 'u' || c == 'U') {
+ next_char();
+ }
+ }
+}
+
+static void parse_number_hex(void)
{
assert(c == 'x' || c == 'X');
next_char();
}
int value = 0;
- for(;;) {
+ while(1) {
if (isdigit(c)) {
value = 16 * value + c - '0';
} else if ('A' <= c && c <= 'F') {
} else if ('a' <= c && c <= 'f') {
value = 16 * value + c - 'a' + 10;
} else {
- lexer_token.type = T_INTEGER;
+ parse_integer_suffix();
+
+ lexer_token.type = T_INTEGER;
lexer_token.v.intvalue = value;
return;
}
next_char();
}
+
+ if(c == '.' || c == 'p' || c == 'P') {
+ next_char();
+ panic("Hex floating point numbers not implemented yet");
+ }
}
-static
-void parse_number_oct(void)
+static void parse_number_oct(void)
{
- assert(c == 'o' || c == 'O');
- next_char();
-
int value = 0;
- for(;;) {
- if ('0' <= c && c <= '7') {
- value = 8 * value + c - '0';
- } else {
- lexer_token.type = T_INTEGER;
- lexer_token.v.intvalue = value;
- return;
- }
+ while(c >= '0' && c <= '7') {
+ value = 8 * value + c - '0';
next_char();
}
+ if (c == '8' || c == '9') {
+ parse_error("invalid octal number");
+ lexer_token.type = T_ERROR;
+ return;
+ }
+
+ lexer_token.type = T_INTEGER;
+ lexer_token.v.intvalue = value;
+
+ parse_integer_suffix();
}
-static
-void parse_number_dec(int first_char)
+static void parse_floatingpoint_exponent(long double value)
{
- int value = 0;
- if(first_char > 0) {
- assert(first_char >= '0' && first_char <= '9');
- value = first_char - '0';
+ unsigned int expo = 0;
+ long double factor = 10.;
+
+ if(c == '-') {
+ next_char();
+ factor = 0.1;
+ } else if(c == '+') {
+ next_char();
}
- for(;;) {
- if (isdigit(c)) {
- value = 10 * value + c - '0';
- } else {
- lexer_token.type = T_INTEGER;
- lexer_token.v.intvalue = value;
- return;
- }
+ while(c >= '0' && c <= '9') {
+ expo = 10 * expo + (c - '0');
next_char();
}
+
+ while(1) {
+ if(expo & 1)
+ value *= factor;
+ expo >>= 1;
+ if(expo == 0)
+ break;
+ factor *= factor;
+ }
+
+ lexer_token.type = T_FLOATINGPOINT;
+ lexer_token.v.floatvalue = value;
+}
+
+static void parse_floatingpoint_fract(int integer_part)
+{
+ long double value = integer_part;
+ long double factor = 1.;
+
+ while(c >= '0' && c <= '9') {
+ factor *= 0.1;
+ value += (c - '0') * factor;
+ next_char();
+ }
+
+ if(c == 'e' || c == 'E') {
+ next_char();
+ parse_floatingpoint_exponent(value);
+ return;
+ }
+
+ lexer_token.type = T_FLOATINGPOINT;
+ lexer_token.v.floatvalue = value;
}
-static
-void parse_number(void)
+static void parse_number_dec(void)
{
- // TODO check for overflow
- // TODO check for various invalid inputs sequences
+ int value = 0;
+
+ while(isdigit(c)) {
+ value = 10 * value + c - '0';
+ next_char();
+ }
+
+ if(c == '.') {
+ next_char();
+ parse_floatingpoint_fract(value);
+ return;
+ }
+ if(c == 'e' || c == 'E') {
+ next_char();
+ parse_floatingpoint_exponent(value);
+ return;
+ }
+ parse_integer_suffix();
+
+ lexer_token.type = T_INTEGER;
+ lexer_token.v.intvalue = value;
+}
+static void parse_number(void)
+{
if (c == '0') {
next_char();
switch (c) {
case 'X':
- case 'x': parse_number_hex(); break;
- case 'o':
- case 'O': parse_number_oct(); break;
- default: parse_number_dec('0');
+ case 'x':
+ parse_number_hex();
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ parse_number_oct();
+ break;
+ case '.':
+ next_char();
+ parse_floatingpoint_fract(0);
+ break;
+ case 'e':
+ case 'E':
+ parse_floatingpoint_exponent(0);
+ break;
+ case '8':
+ case '9':
+ next_char();
+ parse_error("invalid octal number");
+ lexer_token.type = T_ERROR;
+ return;
+ default:
+ put_back(c);
+ c = '0';
+ parse_number_dec();
+ return;
}
} else {
- parse_number_dec(0);
+ parse_number_dec();
}
}
-static
-int parse_escape_sequence(void)
+static int parse_octal_sequence(void)
+{
+ int value = 0;
+ while(1) {
+ if(c < '0' || c > '7')
+ break;
+ value = 8 * value + c - '0';
+ next_char();
+ }
+
+ return value;
+}
+
+static int parse_hex_sequence(void)
+{
+ int value = 0;
+ while(1) {
+ if (c >= '0' && c <= '9') {
+ value = 16 * value + c - '0';
+ } else if ('A' <= c && c <= 'F') {
+ value = 16 * value + c - 'A' + 10;
+ } else if ('a' <= c && c <= 'f') {
+ value = 16 * value + c - 'a' + 10;
+ } else {
+ break;
+ }
+ next_char();
+ }
+
+ return value;
+}
+
+static int parse_escape_sequence(void)
{
while(1) {
int ec = c;
next_char();
switch(ec) {
- case '"': return '"';
+ case '"': return '"';
case '\'': return'\'';
- case '\\':
- EAT_NEWLINE(break;)
- return '\\';
+ case '\\': return '\\';
+ case '?': return '\?';
case 'a': return '\a';
case 'b': return '\b';
case 'f': return '\f';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
- case 'x': /* TODO parse hex number ... */
- parse_error("hex escape sequences not implemented yet");
- return EOF;
+ case 'x':
+ return parse_hex_sequence();
case '0':
case '1':
case '2':
case '5':
case '6':
case '7':
- /* TODO parse octal number ... */
- parse_error("octal escape sequences not implemented yet");
- return EOF;
- case '?':
- if(c != '?') {
- return '?';
- }
- /* might be a trigraph */
- next_char();
- if(replace_trigraph()) {
- break;
- }
- put_back(c);
- c = '?';
- return '?';
-
+ return parse_octal_sequence();
case EOF:
parse_error("reached end of file while parsing escape sequence");
return EOF;
return result;
}
-static
-void parse_string_literal(void)
+static void parse_string_literal(void)
{
unsigned start_linenr = lexer_token.source_position.linenr;
char *string;
while(1) {
switch(c) {
- SKIP_TRIGRAPHS(,
- obstack_1grow(&symbol_obstack, '?');
- next_char();
- break;
- )
-
case '\\':
next_char();
- EAT_NEWLINE(break;)
int ec = parse_escape_sequence();
obstack_1grow(&symbol_obstack, ec);
break;
lexer_token.v.string = result;
}
-#define MATCH_NEWLINE(code) \
- case '\r': \
- next_char(); \
- if(c == '\n') { \
- next_char(); \
- } \
- lexer_token.source_position.linenr++; \
- code; \
- case '\n': \
- next_char(); \
- lexer_token.source_position.linenr++; \
- code;
-
-static
-void parse_character_constant(void)
+static void parse_character_constant(void)
{
assert(c == '\'');
next_char();
int found_char = 0;
while(1) {
switch(c) {
- SKIP_TRIGRAPHS(,
- found_char = '?';
- break;
- )
-
case '\\':
next_char();
- EAT_NEWLINE(break;)
- found_char = '\\';
+ found_char = parse_escape_sequence();
break;
MATCH_NEWLINE(
lexer_token.v.intvalue = found_char;
}
-static
-void skip_multiline_comment(void)
+static void skip_multiline_comment(void)
{
unsigned start_linenr = lexer_token.source_position.linenr;
- int had_star = 0;
while(1) {
switch(c) {
case '*':
next_char();
- had_star = 1;
- break;
-
- case '/':
- next_char();
- if(had_star) {
+ if(c == '/') {
+ next_char();
return;
}
- had_star = 0;
- break;
-
- case '\\':
- next_char();
- EAT_NEWLINE(break;)
- had_star = 0;
- break;
-
- case '?':
- next_char();
- if(c != '?') {
- had_star = 0;
- break;
- }
- next_char();
- if(replace_trigraph())
- break;
- put_back(c);
- c = '?';
- had_star = 0;
- /* we don't put back the 2nd ? as the comment text is discarded
- * anyway */
break;
- MATCH_NEWLINE(had_star = 0; break;)
+ MATCH_NEWLINE(break;)
case EOF:
error_prefix_at(lexer_token.source_position.input_name,
start_linenr);
fprintf(stderr, "at end of file while looking for comment end\n");
return;
+
default:
- had_star = 0;
next_char();
break;
}
}
}
-static
-void skip_line_comment(void)
+static void skip_line_comment(void)
{
while(1) {
switch(c) {
- case '?':
- next_char();
- if(c != '?')
- break;
- next_char();
- if(replace_trigraph())
- break;
- put_back('?');
- /* we don't put back the 2nd ? as the comment text is discarded
- * anyway */
- break;
-
- case '\\':
- next_char();
- if(c == '\n') {
- next_char();
- lexer_token.source_position.linenr++;
- }
- break;
-
case EOF:
- case '\r':
+ return;
+
case '\n':
+ case '\r':
return;
default:
static token_t pp_token;
-static inline
-void next_pp_token(void)
+static inline void next_pp_token(void)
{
lexer_next_preprocessing_token();
pp_token = lexer_token;
}
-static
-void eat_until_newline(void)
+static void eat_until_newline(void)
{
while(pp_token.type != '\n' && pp_token.type != T_EOF) {
next_pp_token();
}
}
-static
-void error_directive(void)
+static void error_directive(void)
{
error_prefix();
fprintf(stderr, "#error directive: \n");
/* parse pp-tokens until new-line */
}
-static
-void define_directive(void)
+static void define_directive(void)
{
lexer_next_preprocessing_token();
if(lexer_token.type != T_IDENTIFIER) {
}
}
-static
-void ifdef_directive(int is_ifndef)
+static void ifdef_directive(int is_ifndef)
{
(void) is_ifndef;
lexer_next_preprocessing_token();
//extect_newline();
}
-static
-void endif_directive(void)
+static void endif_directive(void)
{
//expect_newline();
}
-static
-void parse_line_directive(void)
+static void parse_line_directive(void)
{
if(pp_token.type != T_INTEGER) {
parse_error("expected integer");
eat_until_newline();
}
-static
-void parse_preprocessor_identifier(void)
+static void parse_preprocessor_identifier(void)
{
assert(pp_token.type == T_IDENTIFIER);
symbol_t *symbol = pp_token.v.symbol;
}
}
-static
-void parse_preprocessor_directive()
+static void parse_preprocessor_directive()
{
next_pp_token();
return;
#define ELSE_CODE(code) \
- SKIP_TRIGRAPHS(, \
- code; \
- ) \
- \
- case '\\': \
- next_char(); \
- EAT_NEWLINE(break;) \
- /* fallthrough */ \
default: \
code; \
} \
parse_character_constant();
return;
- case '\\':
- next_char();
- if(c == '\n') {
- next_char();
- lexer_token.source_position.linenr++;
- break;
- } else {
- parse_error("unexpected '\\' found");
- lexer_token.type = T_ERROR;
- }
- return;
-
case '.':
MAYBE_PROLOG
case '.':
ELSE('+')
case '-':
MAYBE_PROLOG
+ MAYBE('>', T_MINUSGREATER)
MAYBE('-', T_MINUSMINUS)
MAYBE('=', T_MINUSEQUAL)
ELSE('-')
MAYBE_PROLOG
MAYBE(':', T_LESSCOLON)
MAYBE('%', T_LESSPERCENT)
+ MAYBE('=', T_LESSEQUAL)
case '<':
MAYBE_PROLOG
MAYBE('=', T_LESSLESSEQUAL)
ELSE('<')
case '>':
MAYBE_PROLOG
+ MAYBE('=', T_GREATEREQUAL)
case '>':
MAYBE_PROLOG
MAYBE('=', T_GREATERGREATEREQUAL)
ELSE('#')
case '?':
- next_char();
- /* just a simple ? */
- if(c != '?') {
- lexer_token.type = '?';
- return;
- }
- /* might be a trigraph */
- next_char();
- if(replace_trigraph()) {
- break;
- }
- put_back(c);
- c = '?';
- lexer_token.type = '?';
- return;
-
case '[':
case ']':
case '(':
case '~':
case ';':
case ',':
+ case '\\':
lexer_token.type = c;
next_char();
return;
void lexer_open_stream(FILE *stream, const char *input_name)
{
input = stream;
- lexer_token.source_position.linenr = 0;
+ lexer_token.source_position.linenr = 1;
lexer_token.source_position.input_name = input_name;
- /* we place a virtual '\n' at the beginning so the lexer knows we're at the
- * beginning of a line */
- c = '\n';
+ next_char();
}
void exit_lexer(void)
projects / cparser / blobdiff